A187139 Number of (n+1)X9 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

1731321, 1908891288, 658156407930, 301728175130790, 127632346709629266, 56423240969024815416

Offset

1,1

Comments

Column 8 of A187140

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 4X9
..1..1..0..0..2..1..2..1..2....1..1..0..0..0..0..2..2..2
..0..0..0..0..0..1..2..0..1....0..0..0..0..0..1..1..0..0
..0..0..0..1..0..0..0..0..2....0..0..0..1..0..0..0..0..1
..0..0..0..1..0..1..1..0..0....0..0..0..1..0..1..0..0..0

Crossrefs

Sequence in context: A157862 A186586 A131639 * A185844 A234130 A177695

Adjacent sequences: A187136 A187137 A187138 * A187140 A187141 A187142

Keyword

nonn

Author

R. H. Hardin Mar 05 2011

Status

approved